Self-resetting prefabricated assembled concrete pier with replaceable energy-dissipation shear parts

Abstract

The self-resetting prefabricated assembled concrete pier comprises a bearing platform, a foundation groove for the bottom of a prefabricated RC pier to be inserted is formed in the top of the bearing platform in a concave mode, a pier bottom steel sleeve is coaxially arranged outside the bottom of the prefabricated RC pier in a sleeving mode, and a steel base used for abutting against the pier bottom steel sleeve is fixedly arranged at the top in the foundation groove. Prestressed tendons vertically penetrate through the center of the steel base and the center of the prefabricated RC pier, the two ends of the steel base and the center of the prefabricated RC pier are anchored and fixed, an annular anchoring bottom steel plate is embedded in the surface of the bearing platform outside the foundation groove, a plurality of shear parts are fixedly arranged on the pier bottom steel sleeve at intervals along the periphery, and the lower ends of the shear parts are welded to the anchoring bottom steel plate; a rubber cushion block is arranged on the anchoring bottom steel plate along the inner circumferential wall of the anchoring bottom steel plate in a cushioned mode, and an annular asphalt hemp knife is arranged between the rubber cushion block and the pier bottom steel sleeve located in the foundation groove. Therefore, the integrity of the RC pier structure is ensured.

Description

Technical Field

[0001] The utility model relates to a self - resetting precast assembled concrete pier with replaceable energy - dissipating shear members. Background Technique

[0002] In order to reduce the impact of bridge construction on the surrounding environment and traffic, improve the construction efficiency of river - crossing bridges, and realize the concept of rapid, green, and industrialized construction, in recent years, the factory precast and assembled rapid bridge construction technology has received extensive attention. The precast pier segments in the factory can not only provide high - quality construction speed for modern pier structures, but also achieve efficient connection on the basis of ensuring construction quality and mechanical properties. Therefore, the construction quality and mechanical property guarantee of the connection part are the key control points of the precast bridge construction technology. At present, the connection forms between precast concrete piers and caissons mainly include grouting sleeve connection, grouting corrugated pipe connection, slot - type connection, socket - type connection, and prestressed steel bar connection, etc. However, although these connection structures are relatively mature in the construction process, there are still problems such as difficult construction, hard - to - detect grouting quality, poor energy - dissipating ability under earthquake action, and difficulty in repair after earthquake damage. These problems lead to general deficiencies in the seismic performance of precast assembled piers.

[0003] Currently, the research on bridge seismic resistance is gradually developing in the direction of improving the recoverability of structural functions, and the seismic design concept has also shifted from traditional ductility design or seismic isolation and dissipation design to resilience - based seismic design. A resilience - based seismic bridge refers to a bridge structure that can maintain or quickly restore its service function without repair or with only minor repair after being affected by an earthquake. Resilience - based seismic bridges can adopt concepts such as rocking structures, self - resetting structures, replaceable components, etc., and combine measures such as new materials, new structures, new components, and new systems to reduce the permanent damage and residual deformation of the bridge structure after an earthquake, thereby shortening the repair and restoration time and quickly restoring the bridge function.

[0004] The replaceable component system installs replaceable shock - absorbing devices at appropriate component positions. During a strong earthquake, the replaceable components are sacrificed to reduce the post - earthquake damage of the main structure. However, from domestic and foreign research, the existing replaceable component systems, such as BRB - double - column piers, energy - dissipating coupling beams - double - column piers, etc., although they can effectively reduce the transverse seismic response, cannot solve other seismic problems except the transverse direction. Content of the Utility Model

[0005] In view of the deficiencies of the prior art, the technical problem to be solved by the present utility model is to provide a self-centering precast assembled concrete pier with replaceable energy-dissipating shear members, which is equipped with replaceable energy-dissipating shear members and prestressing tendons for self-centering of the pier. The pier is simply designed with a clear force mechanism, ensuring that the pier column has sufficient strength, stiffness and energy-dissipating capacity. In addition, the pier also has the characteristics of being replaceable and quickly restorable after being damaged by a strong earthquake.

[0006] To solve the above technical problems, the technical solution of the present utility model is: a self-centering precast assembled concrete pier with replaceable energy-dissipating shear members, including a bearing platform, a foundation groove for inserting the bottom of the precast RC pier is recessed at the top of the bearing platform, a pier bottom steel sleeve is coaxially sleeved outside the bottom of the precast RC pier, a steel base for abutting against the pier bottom steel sleeve is fixedly arranged at the top of the foundation groove, the centers of the steel base and the precast RC pier are vertically penetrated by prestressing tendons and both ends are anchored and fixed, an annular anchoring bottom steel plate is embedded on the surface of the bearing platform outside the foundation groove, and a plurality of shear members are fixedly arranged at intervals along the outer circumference of the pier bottom steel sleeve, and the lower ends of the shear members are all welded to the anchoring bottom steel plate; a rubber cushion block is padded along the inner circumferential wall of the anchoring bottom steel plate, and an annular bituminous hemp is arranged between the rubber cushion block and the pier bottom steel sleeve located in the foundation groove.

[0007] Further, the shear members are all in the shape of a right trapezoid, the vertical right-angled sides are welded and fixed to the outer wall of the pier bottom steel sleeve near the top end through welding end plates, and the horizontal right-angled sides are all welded to the anchoring bottom steel plate.

[0008] Further, the bituminous hemp is located below the welding end plate, and arc grooves for making way for the bituminous hemp are opened at the right-angled corners of the lower ends of the shear members.

[0009] Further, the anchoring bottom steel plate is embedded and fixed on the bearing platform through anchor bolts, and the top surface of the anchoring bottom steel plate is at the same level as the top surface of the bearing platform.

[0010] Further, a plurality of annular stiffening ribs are fixedly arranged at intervals along the vertical height direction of the inner wall of the pier bottom steel sleeve, and the annular stiffening ribs are cast integrally with the precast RC pier.

[0011] Further, the upper and lower ends of the prestressing tendons respectively penetrate through the precast RC pier and the steel base and are anchored at the ends through anchor ingots.

[0012] Further, the bottom of the pier bottom steel sleeve is in a concave arc shape, and the top of the steel base is also in a concave arc shape to cooperate with and abut against the pier bottom steel sleeve.

[0013] Further, a polytetrafluoroethylene plate is fixedly arranged on the arc surface of the top of the steel base.

[0014] Further, a gap is left between the bearing platform and the precast RC pier.

[0015] Compared with the prior art, the utility model has the following beneficial effects: The pier structure has a clear force mechanism and a reliable force transmission path, and has the characteristics of being able to replace damaged shear members and quickly recover after being subjected to strong earthquake action. This design solves the problems of insufficient energy dissipation capacity of traditional precast assembled piers and difficulty in repair after an earthquake.

[0016] The following further describes the present utility model in detail with reference to the accompanying drawings and specific embodiments. Description of the Drawings

[0017] Figure 1 is a schematic structural diagram of an embodiment of the present utility model;

[0018] Figure 2 is Figure 1 a cross-sectional view taken along line A-A in

[0019] Figure 3 is Figure 1 an enlarged schematic view of B in

[0020] In the figure: 1 - precast RC pier; 2 - shear member; 3 - asphalt hemp knife; 4 - pier bottom steel sleeve; 5 - steel base; 6 - polytetrafluoroethylene plate; 7 - pile cap; 8 - anchor bolt; 9 - anchoring bottom steel plate; 10 - rubber cushion block; 11 - welding end plate; 12 - annular stiffening rib; 13 - prestressed tendon; 14 - anchor; 15 - foundation groove, 16 - arc groove. Specific Embodiments

[0021] To make the above features and advantages of the present utility model more obvious and understandable, specific embodiments are given below and described in detail in conjunction with the accompanying drawings.

[0022] As Figures 1 to 3 shown, a self-centering precast assembled concrete pier with replaceable energy-dissipating shear members includes a pile cap 7. A foundation groove 15 for inserting the bottom of the precast RC pier 1 is recessed at the top of the pile cap. A pier bottom steel sleeve 4 is coaxially sleeved outside the bottom of the precast RC pier. A steel base 5 for abutting against the pier bottom steel sleeve is fixedly provided at the top inside the foundation groove. The centers of the steel base and the precast RC pier are both vertically penetrated by prestressed tendons 13 and anchored at both ends. Conduits are reserved at the central parts of the steel base and the precast RC pier for passing the prestressed tendons. An annular anchoring bottom steel plate 9 is embedded on the surface of the pile cap outside the foundation groove. A plurality of shear members 2 are fixedly provided at intervals along the outer circumference of the pier bottom steel sleeve, and the lower ends of the shear members are welded to the anchoring bottom steel plate; a rubber cushion block 10 is padded along the inner circumferential wall of the anchoring bottom steel plate, and an annular asphalt hemp knife 3 is provided between the rubber cushion block and the pier bottom steel sleeve located in the foundation groove.

[0023] In the embodiment of the present utility model, the shear members are all in the shape of right trapezoids, and their vertical right-angle sides are all welded and fixed to the outer wall near the top of the pier bottom steel sleeve through the welding end plates 11, and their horizontal right-angle sides are all welded to the anchoring bottom steel plate. The shear members are made of low-yield-point steel, which can further improve the actual energy dissipation effect on the premise of meeting the lateral stiffness.

[0024] In the embodiment of the present utility model, the asphalt hemp yarn is located below the welding end plate, and arc grooves 16 for making way for the asphalt hemp yarn are provided at the right-angle positions at the lower ends of the shear members.

[0025] In the embodiment of the present utility model, the anchoring bottom steel plate is embedded in the bearing platform through the anchor bolts 8, and the top surface of the anchoring bottom steel plate is at the same level as the top surface of the bearing platform. After an earthquake, the damaged shear members can be cut off, removed and replaced, so that the seismic performance of the precast RC pier can be quickly restored.

[0026] In the embodiment of the present utility model, a plurality of annular stiffening ribs 12 are fixedly arranged at intervals along the vertical height direction of the inner wall of the pier bottom steel sleeve, which can provide effective support and transfer of loads, and the annular stiffening ribs are cast integrally with the precast RC pier.

[0027] In the embodiment of the present utility model, the upper and lower ends of the prestressed tendons respectively pass through the precast RC pier and the steel base and are anchored at the ends by the anchor 14.

[0028] In the embodiment of the present utility model, the bottom of the pier bottom steel sleeve is in a concave arc shape, and the top of the steel base is also in a concave arc shape to fit and abut against the pier bottom steel sleeve, which can endow it with better rotational ability so as to more fully guide the seismic energy to the shear members.

[0029] In the embodiment of the present utility model, a polytetrafluoroethylene plate 6 is fixedly arranged on the arc surface at the top of the steel base, which can further reduce the friction between the pier bottom steel sleeve and the steel base.

[0030] In the embodiment of the present utility model, a gap is left between the bearing platform and the precast RC pier, and its function is to enable the top of the precast RC pier to swing within a certain range.

[0031] The construction method of the embodiment of the present utility model can be carried out according to the following steps:

[0032] S1: Pour the bearing platform: Construct the bearing platform on site, bind the steel bars of the bearing platform, accurately arrange the steel base and the anchor bolts, install the formwork of the bearing platform, pour the concrete, and remove the formwork after the concrete cures to reach the designed strength;

[0033] S2: The precast RC bridge pier is constructed at the prefabrication plant. The steel bars of the bridge pier are tied, and a steel sleeve at the bottom of the bridge pier is set. Circular stiffeners are welded on the inner side of the steel sleeve according to the range that needs to be strengthened. The formwork of the bridge pier is installed, concrete is poured, and the formwork is removed after the concrete cures to reach the designed strength.

[0034] S3: The anchor bottom steel plate is installed and anchored to the bearing platform through anchor bolts. The precast RC bridge pier is hoisted into place, and the prestressed tendon 13 is passed through the reserved duct. After being in place, the prestressed tendon is tensioned at the top of the pier and sealed. Rubber pads are installed inside the anchor bottom steel plate, and asphalt hemp ropes are buried in the gap between the rubber pads and the steel sleeve at the bottom of the pier. Temporary supports are erected to temporarily fix the precast RC bridge pier to ensure that it does not overturn during the installation process.

[0035] S4: The welding end plate is installed by welding on the side of the steel sleeve at the bottom of the pier. Then the shear members are installed and fixed to the anchor bottom steel plate and the welding end plate by welding.

[0036] S5: The superstructure of the bridge is installed, and the bridge deck system and its affiliated facilities are constructed.

[0037] In the embodiment of the present utility model, for the damaged and need-to-be-repaired-and-replaced after an earthquake, the main construction method is as follows:

[0038] (1) Temporary inclined supports are erected around the pier body of the precast RC bridge pier to ensure that the pier body does not overturn during the replacement process.

[0039] (2) The shear members that need to be replaced are cut, and the cutting part is polished flat.

[0040] (3) New shear members are welded again; after the welding is completed, the temporary supports around the pier body are removed, and the repair and replacement of the shear members are completed.

[0041] The present utility model is not limited to the above best implementation manner. Anyone can obtain other various forms of self-centering precast assembled concrete bridge piers with replaceable energy-dissipating shear members under the inspiration of the present utility model. All equal changes and modifications made according to the scope of the patent application of the present utility model shall fall within the coverage scope of the present utility model.

Claims

1. A self-resetting prefabricated assembled concrete bridge pier with replaceable energy-absorbing shear members, characterized in that: The invention comprises a cap, wherein a foundation groove is recessed on the top of the cap for inserting the bottom of the prefabricated RC pier, a pier bottom steel sleeve is coaxially sleeved on the outside of the bottom of the prefabricated RC pier, a steel base for abutting the pier bottom steel sleeve is fixedly arranged on the top of the foundation groove, the steel base and the center of the prefabricated RC pier are vertically penetrated by prestressed tendons and both ends are anchored and fixed, an annular anchor bottom steel plate is embedded on the surface of the cap outside the foundation groove, a plurality of shear members are fixedly arranged along the outer circumference of the pier bottom steel sleeve at intervals, and the lower ends of the shear members are welded to the anchor bottom steel plate; an annular asphalt hemp knife is arranged between the inner ring of the anchor bottom steel plate and the pier bottom steel sleeve located in the foundation groove.

2. The self-resetting prefabricated assembled concrete bridge pier with replaceable energy-absorbing shear members according to claim 1, characterized in that: The anchor bottom steel plate is padded with rubber pads along its inner circumferential wall, and the asphalt hemp knife is located between the rubber pads and the pier bottom steel sleeve in the foundation groove.

3. The self-resetting prefabricated assembled concrete bridge pier with replaceable energy-absorbing shear members according to claim 1, characterized in that: The shear members are all in the shape of right-angle trapezoids, and their vertical right-angle sides are all welded and fixed to the outer wall of the pier bottom steel sleeve near the top through welded end plates, and their horizontal right-angle sides are all welded to the anchor bottom steel plate.

4. The self-resetting prefabricated assembled concrete bridge pier with replaceable energy-absorbing shear members according to claim 3 is characterized by: The asphalt hemp knife is located below the welding end plate, and arc grooves for giving way to the asphalt hemp knife are provided at right angles at the lower ends of the shear members.

5. The self-resetting prefabricated assembled concrete bridge pier with replaceable energy-absorbing shear members according to claim 1, characterized in that: The anchor bottom steel plate is embedded on the cap by anchor bolts, and the top surface of the anchor bottom steel plate is at the same level as the top surface of the cap.

6. The self-resetting prefabricated assembled concrete bridge pier with replaceable energy-absorbing shear members according to claim 1, characterized in that: A plurality of annular stiffening ribs are fixedly arranged at intervals on the inner wall of the pier bottom steel sleeve along its vertical height direction, and the annular stiffening ribs are cast as a whole with the prefabricated RC bridge pier.

7. The self-resetting prefabricated assembled concrete bridge pier with replaceable energy-absorbing shear members according to claim 1, characterized in that: The upper and lower ends of the prestressed tendons pass through the prefabricated RC bridge pier and the steel base respectively and are anchored at the ends through anchors.

8. The self-resetting prefabricated assembled concrete bridge pier with replaceable energy-absorbing shear members according to claim 1, characterized in that: The bottom of the pier bottom steel sleeve is in a concave arc shape, and the top of the steel base is also in a concave arc shape to cooperate and abut against the pier bottom steel sleeve.

9. The self-resetting prefabricated assembled concrete bridge pier with replaceable energy-absorbing shear members according to claim 1, characterized in that: A tetrafluoroethylene plate is fixedly arranged on the arc surface at the top of the steel base.

10. The self-resetting prefabricated assembled concrete bridge pier with replaceable energy-absorbing shear members according to claim 1, characterized in that: A gap is left between the cap and the prefabricated RC bridge pier.

Images